From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: tap/bridge: Dropping NETIF_F_GSO/NETIF_F_SG Date: Wed, 4 May 2011 21:18:14 +0300 Message-ID: <20110504181813.GA17547@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org, Ben Hutchings , herbert@gondor.hengli.com.au To: =?utf-8?B?TWljaGHFgiBNaXJvc8WCYXc=?= Return-path: Received: from mx1.redhat.com ([209.132.183.28]:51455 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753835Ab1EDSSg (ORCPT ); Wed, 4 May 2011 14:18:36 -0400 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: BTW, I just noticed that net-next spits out many of the following when I run any VMs: tap0: Dropping NETIF_F_SG since no checksum feature. tap0: Dropping NETIF_F_GSO since no SG feature. tap0: Features changed: 0x401b4849 -> 0x40004040 device msttap0 entered promiscuous mode br0: Dropping NETIF_F_GSO since no SG feature. br0: port 1(msttap0) entering forwarding state br0: port 1(msttap0) entering forwarding state tap0: Features changed: 0x40004040 -> 0x40024849 tap0: Dropping NETIF_F_SG since no checksum feature. tap0: Dropping NETIF_F_GSO since no SG feature. tap0: Features changed: 0x40024849 -> 0x40004040 br0: Dropping NETIF_F_GSO since no SG feature. tap0: Dropping NETIF_F_SG since no checksum feature. tap0: Dropping NETIF_F_GSO since no SG feature. tap0: Dropping NETIF_F_SG since no checksum feature. tap0: Dropping NETIF_F_GSO since no SG feature. tap0: Dropping NETIF_F_SG since no checksum feature. tap0: Dropping NETIF_F_GSO since no SG feature. tap0: Dropping NETIF_F_SG since no checksum feature. tap0: Dropping NETIF_F_GSO since no SG feature. tap0: Features changed: 0x40004040 -> 0x401b4849 tap0: Dropping NETIF_F_SG since no checksum feature. tap0: Dropping NETIF_F_GSO since no SG feature. tap0: Features changed: 0x401b4849 -> 0x40004040 br0: Dropping NETIF_F_GSO since no SG feature. My problem is not primarily with warnings: will that linearize all packets and disable GSO for tap and bridge? If yes it can't be good for performance... -- MST